EP1674250A1 - Building drum for tire belts - Google Patents

Building drum for tire belts Download PDF

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Publication number
EP1674250A1
EP1674250A1 EP05112437A EP05112437A EP1674250A1 EP 1674250 A1 EP1674250 A1 EP 1674250A1 EP 05112437 A EP05112437 A EP 05112437A EP 05112437 A EP05112437 A EP 05112437A EP 1674250 A1 EP1674250 A1 EP 1674250A1
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EP
European Patent Office
Prior art keywords
drum
diameter
tire
circumferential direction
web
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05112437A
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German (de)
French (fr)
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EP1674250B1 (en
Inventor
Jacques Auclair
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Michelin Recherche et Technique SA Switzerland
Michelin Recherche et Technique SA France
Societe de Technologie Michelin SAS
Original Assignee
Michelin Recherche et Technique SA Switzerland
Michelin Recherche et Technique SA France
Societe de Technologie Michelin SAS
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Application filed by Michelin Recherche et Technique SA Switzerland, Michelin Recherche et Technique SA France, Societe de Technologie Michelin SAS filed Critical Michelin Recherche et Technique SA Switzerland
Publication of EP1674250A1 publication Critical patent/EP1674250A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/24—Drums
    • B29D30/242—Drums for manufacturing substantially cylindrical tyre components without cores or beads, e.g. treads or belts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T152/00—Resilient tires and wheels
    • Y10T152/10—Tires, resilient
    • Y10T152/10495—Pneumatic tire or inner tube
    • Y10T152/10765—Characterized by belt or breaker structure

Definitions

  • the invention relates to the field of tire manufacturing, and in particular the field of manufacturing crown reinforcement belts.
  • These crown reinforcement belts are usually composed of one or more plies stacked one on top of the other.
  • Each of these sheets is formed from cables parallel to each other and embedded in a mixture of rubbery nature. These cables form a given angle with the circumferential direction of the tire.
  • the cables may consist of one or more strands, themselves formed from single textile son or more generally metal in the case of crown reinforcement plies.
  • the reinforcing belts generally consist of at least two plies, the ropes of which form, with respect to the circumferential direction, angles having opposite signs, and absolute values close to one another. the other but not necessarily identical. Once in place these layers create a triangulation with the plies of the carcass reinforcement whose cables are generally at an angle of 90 ° with the longitudinal direction.
  • the laying of the crown reinforcement plies takes place after having shaped the carcass obtained in a first stage, that is to say after having given a toric shape to the tire.
  • Said carcass comprises, in general, a carcass reinforcement ply anchored at both ends to reinforcing rings of the bead.
  • the belt plies are laid when the diameter of the blank is close to the final diameter of the envelope. This diameter is calculated to allow the casing press vulcanization of said final blank.
  • Another method is to make the entire vertex on a cylindrical shape called vertex shape, whose diameter is also close to the diameter final, and on which are deposited successively the crown reinforcing plies and the profiles constituting the crown portion of the casing and comprising among others the tread.
  • the completed top is then transferred by a transfer ring on the carcass which conforms to adhere to the inner part of the top.
  • top layers whose reinforcing cables have varying angles along their length More particularly, the angle of the reinforcements relative to the longitudinal direction is lower in the center than on the edges of the sheet.
  • This S-shaped arrangement has the effect of facilitating the flattening of the tire by improving comfort and stability, and reducing wear phenomena at the edge of the sheet.
  • This type of tire is described by way of example in patent FR 2,037,520 or in patent EP 312,300.
  • a method of producing this particular form of crown belt is disclosed in the aforementioned patent FR 2 037 520. It consists in depositing two crown reinforcement plies on one another, adhering them strongly over their entire length and on part of their width and stretch the assembly in the longitudinal direction.
  • a variant of this method consists in including a separating element on a part of the width, so as to allow slippage of the plies and to delimit the areas of the edge of the ply in which it is desired to make this angle change. Once stabilized, the sheet is placed directly on the carcass of the tire previously curved to its toric shape.
  • the invention that is the subject of the present application relates to a method and a device for making an assembly on a vertex shape of crown reinforcement plies whose cables form along their length angles that vary with the circumferential direction, while precisely controlling the geometry and position on the laying drum of the ring thus obtained.
  • a drum of variable diameter of generally cylindrical shape comprising a set of first holding means arranged circumferentially to the equator of said drum and adapted to adhere to the drum the portion of the web disposed to the right of these means and characterized in that it comprises a set of second holding means adapted to alternately adhere or slide freely on the drum part of the web placed in line with said second means, and arranged circumferentially and axially on either side of the equator over the entire surface of said drum.
  • the assembly of the crown belt plies is done by positioning the drum at a first diameter. Depositing the first crown belt reinforcing ply whose reinforcing ropes make a given angle with the circumferential direction, while activating the first and second means so as to adhere the entire ply on the surface of the drum.
  • the second crown belt web composed of reinforcing cables making with the circumferential direction a given angle of opposite sign to the angle of the reinforcements forming the first web.
  • the second ply is then strongly adhered to the first ply.
  • the second means is activated so as to allow the sliding of the first web to the right of said second means, and the drum is positioned at a second diameter greater than the first diameter.
  • These products may comprise other crown reinforcing plies that can form an angle possibly zero with the circumferential direction but also rubber profiles, among which is the tread of the tire.
  • this device is particularly interesting for accurately controlling the geometric position of the products constituting the vertex with respect to each other, but also with respect to a reference taken on the drum.
  • the final realization of the tire is then done in a completely conventional manner by grasping the top thus produced with the aid of a transfer ring and depositing it on the shaped carcass.
  • the drum 1 shown in Figure 1 comprises a set of elements 2 arranged equidistant to an axis of rotation XX '. These elements are movable radially and make it possible to vary the substantially cylindrical surface of the drum from a first diameter D1 to a second diameter D2.
  • Each element 2 carries in its axial direction housings 20, in which are placed respectively the first holding means 3, and the second holding means 4.
  • the first holding means 3 are arranged axially in the middle of each of the elements 2, which makes it possible to form a set of first holding means arranged circumferentially on the equator EE 'of the drum 1.
  • the equator is defined as being the intersection of a plane perpendicular to the axis of rotation XX 'of the drum and passing axially in the middle of the surface of the drum, with the cylinder formed by the surface of said drum.
  • first holding means 3 An exemplary embodiment of first holding means 3 is shown in FIG. 7 and can be likened to a pneumatic valve 40.
  • the body of the valve 40 with a substantially radial axis AA ', is disposed in the housing 20 of the element 2.
  • the body of the valve 40 has a series of orifices 45 placed on its lateral part. The orifices communicate with a chamber 46.
  • the body of the valve contains a tubular valve 41 sliding along the same axis AA 'and having at each of its ends respectively a seat 43 and a outlet 47.
  • the seat of the valve 43 rests on the bearing surface 44 under the action of the spring 42, and prevents the passage of air between the orifices 45 and the chamber 46.
  • the body of the valve 41 comprises a conduit which communicating the chamber 46 and the outlet 47.
  • the outlet 47 is arranged to be radially slightly outside the plane formed by the surface of the element 2.
  • the orifices 45 are connected to a vacuum source (not shown) .
  • the valve 41 is returned by pushing it radially inwards.
  • This action has the effect of taking off the seat 43 of the valve from its range 44, and to put in communication the chamber 46 and the orifices 45, which causes a depression at the outlet 47 of the valve.
  • the arrows shown in FIG. 8 make it possible to visualize the circulation of the air. This results in a vacuum adhesion force which comes to press the web to the surface of the drum, depriving it of any possibility of displacement to the right of the immediate vicinity of the exit 47.
  • the second means are similar to the first means. They are arranged axially on both sides of the equator EE '. However, they differ from the first means 3, in that the orifices 45 can be connected alternately to a vacuum source and operate as suction cups, as has been explained above, or to a source of air under pressure. In this second case, the operation of the second means is illustrated in FIG. 9.
  • the valve 41 is held in the retracted position by the action of the web N1 on the outlet 47.
  • the air can then flow freely in the direction of the arrows from the orifices 45 to the outlet 47. This results in the creation of a thin air cushion between the surface of the element 2 and the N1 web which has the effect of promoting the sliding of the web on the surface of the drum located in the immediate vicinity of the outlet 47.
  • the setting of the spring 42 and the air pressure at the inlet of the orifices 45 is adjusted so as to allow the closure of the communication between the chamber 46 and the orifices 45 when the web N1 is removed.
  • first means and second means from pneumatic valves are particularly simple to implement. However, it is not excluded from considering first electromagnetic means that can be particularly effective when the crown belt plies are metal sheets.
  • FIG. 2 represents the drum 1 positioned at its diameter D2
  • FIGS. 3 and 4 represent the drum 1 with the diameters D1 and D2 in perspective view.
  • the mechanisms controlling the radial movement of the elements 2, as well as the means for supporting and rotating the drum about the axis XX ', are widely known to those skilled in the art and are not the subject of the present description, they are not shown in the figures.
  • FIGS. 5 and 6 illustrate, diagrammatically, the steps of shaping a crown reinforcing belt composed of two plies N1 and N2 respectively of width L1 and L2, L2 being generally less than L1.
  • the reinforcing cables composing the plies make angles ⁇ 1 and ⁇ 2, of opposite signs, with the circumferential direction.
  • the drum 1 is positioned at a first diameter D1 and the orifices 45 of the second means are connected to a vacuum tap.
  • the outlets 47 of the valves 41 are radially pushed back, which has the effect, as we have seen previously, of keeping the ply N1 firmly in position on the surface of the drum 1. also so as to make the center of the lap coincide with the equator EE 'so as to ensure the geometrical alignment of the components of the tire with respect to a known reference.
  • a second layer N2 is then deposited.
  • the two plies must be strongly adhered to one another. It will be noted that keeping the plies in position on the surface of the drum during this operation is a means of preserving the geometric alignment imparted at the time of laying the plies.
  • the triangulation of the plies whose width passes respectively from L1 to L1 'and from L2 to L2' is caused.
  • the angles ⁇ 1 and ⁇ 2 formed by the cables with the circumferential direction to the equator pass respectively to the values ⁇ 1 'and ⁇ 2' respectively lower than ⁇ 1 and ⁇ 2.
  • These values ⁇ 1 'and ⁇ 2' are substantially constant over the length of the cables, but it is observed that these angles increase strongly at each end of the cables in the edge zone of the plies N1 and N2 to give an S shape to the cables of the plies.
  • the difference between the angle formed by a cable with the circumferential direction at its ends may vary from 2 ° to 15 ° with respect to the angle that the same cable makes with the circumferential direction at the center of the ply.
  • the pitch of the cables is narrowing. In other words the distance between two consecutive cables and substantially parallel to each other decreases during the conformation phase of the layers. And this phenomenon is more marked in the center than on the edges of the sheet.
  • the device makes it possible to draw an advantageous advantage from this known phenomenon. Indeed, by decreasing the pitch and increasing the cable density in the center, it increases the bending stiffness of the top and improves the life on wear of the tire.
  • the conformation rate is equal to the ratio between the second D2 and the first diameter D1.
  • the degree of conformation can vary between 1.03 and 1.5.
  • This mode of implementation makes it possible at the same time to simplify the industrial complexity by reducing the reference number of different pitch layers P1, and to give an additional margin of maneuver for the choice of cables that it becomes possible to select. among cables of smaller diameter and whose use is authorized by increasing the density by conformation, according to the method of the invention, so as to obtain a structural strength similar to that which one would have obtained with stronger cables and a higher pitch.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Tyre Moulding (AREA)
  • Tires In General (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

The maintenance unit (3, 4) is arranged circumferentially to the equator of drum and enables the adherence on the drum (1) of the belt. Another unit arranged circumferentially and axially on both sides of the equator on the entire drum surface to enable adherence or free gliding on the drum of the belt. The two maintenance units are formed by tire valves opening into the external surface of the drum and alternatively connected to a vacuum inlet or a pipe supplying pressurized air. An independent claim is also included for process of assembling a tire.

Description

L'invention concerne le domaine de la fabrication des pneumatiques, et en particulier le domaine de la fabrication des ceintures de renfort sommet. Ces ceintures de renfort sommet sont usuellement composées d'une ou plusieurs nappes empilées les unes sur les autres. Chacune de ces nappes est formée à partir de câbles parallèles entre eux et enrobés dans un mélange de nature caoutchoutique. Ces câbles forment un angle donné avec la direction circonférentielle du pneumatique. Les câbles peuvent être constitués d'un ou plusieurs torons, eux-mêmes formés à partir de fils unitaires textiles ou plus généralement métalliques dans le cas des nappes de renfort sommet.The invention relates to the field of tire manufacturing, and in particular the field of manufacturing crown reinforcement belts. These crown reinforcement belts are usually composed of one or more plies stacked one on top of the other. Each of these sheets is formed from cables parallel to each other and embedded in a mixture of rubbery nature. These cables form a given angle with the circumferential direction of the tire. The cables may consist of one or more strands, themselves formed from single textile son or more generally metal in the case of crown reinforcement plies.

Afin de conférer au pneumatique les qualités attendues, les ceintures de renfort sont généralement constituées d'au moins deux nappes dont les câbles forment, par rapport à la direction circonférentielle, des angles ayant des signes opposés, et des valeurs absolues proches l'une de l'autre mais pas nécessairement identiques. Une fois mises en place ces nappes créent une triangulation avec les nappes de l'armature carcasse dont les câbles font généralement un angle de 90° avec la direction longitudinale.In order to give the tire the expected qualities, the reinforcing belts generally consist of at least two plies, the ropes of which form, with respect to the circumferential direction, angles having opposite signs, and absolute values close to one another. the other but not necessarily identical. Once in place these layers create a triangulation with the plies of the carcass reinforcement whose cables are generally at an angle of 90 ° with the longitudinal direction.

Selon les procédés de fabrication couramment employés dans l'industrie du pneumatique, la pose des nappes de renfort sommet s'effectue après avoir conformé la carcasse obtenue dans un premier stade, c'est-à-dire après avoir conféré une forme torique à l'ébauche de pneumatique de forme sensiblement cylindrique. Ladite carcasse comprend, en général, une nappe de renfort carcasse ancrée à ses deux extrémités à des anneaux de renfort du bourrelet.According to the manufacturing processes commonly used in the tire industry, the laying of the crown reinforcement plies takes place after having shaped the carcass obtained in a first stage, that is to say after having given a toric shape to the tire. tire blank of substantially cylindrical shape. Said carcass comprises, in general, a carcass reinforcement ply anchored at both ends to reinforcing rings of the bead.

Les nappes de ceinture sont posées lorsque le diamètre de l'ébauche est proche du diamètre définitif de l'enveloppe. Ce diamètre est calculé pour permettre l'emboîtage en presse de vulcanisation de ladite ébauche finale.The belt plies are laid when the diameter of the blank is close to the final diameter of the envelope. This diameter is calculated to allow the casing press vulcanization of said final blank.

Une autre méthode consiste à réaliser l'ensemble du sommet sur une forme cylindrique dite forme sommet, dont le diamètre est également proche du diamètre définitif, et sur laquelle sont déposées successivement les nappes de renfort sommet et les profilés constituant la partie sommet de l'enveloppe et comprenant entre autre la bande de roulement. Le sommet achevé est alors transféré par un anneau de transfert sur la carcasse qui, en se conformant, vient adhérer à la partie interne du sommet.Another method is to make the entire vertex on a cylindrical shape called vertex shape, whose diameter is also close to the diameter final, and on which are deposited successively the crown reinforcing plies and the profiles constituting the crown portion of the casing and comprising among others the tread. The completed top is then transferred by a transfer ring on the carcass which conforms to adhere to the inner part of the top.

D'autre part, et toujours dans le but d'améliorer la performance des pneumatiques il a été mis en évidence l'intérêt de réaliser des nappes sommets dont les câbles de renfort ont des angles variables sur leur longueur. Plus particulièrement, l'angle des renforts par rapport à la direction longitudinale est plus faible au centre, que sur les bords de la nappe. Cette disposition en S a pour effet de faciliter la mise à plat du pneumatique en améliorant le confort et la stabilité, et de réduire les phénomènes d'usure en bord de nappe. Ce type de pneumatique est décrit à titre d'exemple dans le brevet FR 2 037 520 ou encore dans le brevet EP 312 300.On the other hand, and always with the aim of improving the performance of the tires, it has been demonstrated that it is advantageous to make top layers whose reinforcing cables have varying angles along their length. More particularly, the angle of the reinforcements relative to the longitudinal direction is lower in the center than on the edges of the sheet. This S-shaped arrangement has the effect of facilitating the flattening of the tire by improving comfort and stability, and reducing wear phenomena at the edge of the sheet. This type of tire is described by way of example in patent FR 2,037,520 or in patent EP 312,300.

Les mécanismes liés à la triangulation des nappes sont largement connus de l'homme du métier, et font l'objet de nombreuses publications, parmi lesquelles on citera la publication FR 2 797 213 de la demanderesse.The mechanisms related to the triangulation of webs are widely known to those skilled in the art, and are the subject of numerous publications, among which will be mentioned the publication FR 2 797 213 of the applicant.

Un procédé de réalisation de cette forme particulière de ceinture sommet est exposé dans le brevet précité FR 2 037 520. Il consiste à déposer deux nappes de renfort sommet l'une sur l'autre, à les faire adhérer fortement sur toute leur longueur et sur une partie de leur largeur et à étirer l'ensemble dans la direction longitudinale. Une variante de ce procédé consiste à inclure un élément séparateur sur une partie de la largeur, de manière à permettre le glissement des nappes et à délimiter les zones du bord de nappe dans lesquelles on désire procéder à cette modification d'angle. Une fois stabilisée, la nappe est posée directement sur la carcasse du pneumatique préalablement galbée à sa forme torique.A method of producing this particular form of crown belt is disclosed in the aforementioned patent FR 2 037 520. It consists in depositing two crown reinforcement plies on one another, adhering them strongly over their entire length and on part of their width and stretch the assembly in the longitudinal direction. A variant of this method consists in including a separating element on a part of the width, so as to allow slippage of the plies and to delimit the areas of the edge of the ply in which it is desired to make this angle change. Once stabilized, the sheet is placed directly on the carcass of the tire previously curved to its toric shape.

On observera que ce procédé nécessite d'assembler les nappes sur un poste indépendant, mais également que la réalisation de la jonction des deux extrémités de l'assemblage ainsi réalisé peut s'avérer malcommode en raison de la superposition de nappes présentant des angles différents.It will be observed that this method requires assembling the plies on an independent station, but also that the realization of the junction of the two ends of the assembly thus produced may prove inconvenient due to the superposition of plies having different angles.

Le procédé décrit dans la demande FR 2 797 213 permet de réaliser un sommet présentant les caractéristiques exposées ci-dessus, mais il s'accompagne de la déradialisation de la nappe de renfort carcasse sous la zone sommet.The method described in patent application FR 2 797 213 makes it possible to produce a peak having the characteristics described above, but it is accompanied by the deradialization of the carcass reinforcement ply under the crown zone.

L'invention faisant l'objet de la présente demande concerne un procédé et un dispositif permettant de réaliser un assemblage sur une forme sommet des nappes de renfort sommet dont les câbles forment sur leur longueur des angles variables avec la direction circonférentielle, tout en maîtrisant précisément la géométrie et la position sur le tambour de pose de l'anneau ainsi obtenu.The invention that is the subject of the present application relates to a method and a device for making an assembly on a vertex shape of crown reinforcement plies whose cables form along their length angles that vary with the circumferential direction, while precisely controlling the geometry and position on the laying drum of the ring thus obtained.

A cet effet, il est proposé de réaliser de manière séparée l'assemblage des éléments constituant le sommet de l'enveloppe sur un tambour à diamètre variable de forme généralement cylindrique, comprenant un ensemble de premier moyens de maintien disposés circonférentiellement à l'équateur dudit tambour et adaptés pour faire adhérer sur le tambour la partie de la nappe disposée au droit de ces moyens et caractérisé en ce qu'il comporte un ensemble de seconds moyens de maintien adaptés pour alternativement faire adhérer ou faire glisser librement sur le tambour la partie de la nappe placée au droit des dits second moyens, et disposés circonférentiellement et axialement de part et d'autre de l'équateur sur l'ensemble de la surface dudit tambour.For this purpose, it is proposed to separate the assembly of the elements constituting the apex of the envelope on a drum of variable diameter of generally cylindrical shape, comprising a set of first holding means arranged circumferentially to the equator of said drum and adapted to adhere to the drum the portion of the web disposed to the right of these means and characterized in that it comprises a set of second holding means adapted to alternately adhere or slide freely on the drum part of the web placed in line with said second means, and arranged circumferentially and axially on either side of the equator over the entire surface of said drum.

L'assemblage des nappes de ceinture sommet se fait en positionnant le tambour à un premier diamètre. On dépose la première nappe de renfort de ceinture sommet dont les câbles de renfort font un angle donné avec la direction circonférentielle, tout en activant les premiers et deuxièmes moyens de manière à faire adhérer l'ensemble de la nappe sur la surface du tambour.The assembly of the crown belt plies is done by positioning the drum at a first diameter. Depositing the first crown belt reinforcing ply whose reinforcing ropes make a given angle with the circumferential direction, while activating the first and second means so as to adhere the entire ply on the surface of the drum.

On dépose alors la seconde nappe de ceinture sommet, composée de câbles de renfort faisant avec la direction circonférentielle un angle donné de signe opposé à l'angle des renforts formant la première nappe. On fait alors adhérer fortement la seconde nappe sur la première nappe.Then depositing the second crown belt web, composed of reinforcing cables making with the circumferential direction a given angle of opposite sign to the angle of the reinforcements forming the first web. The second ply is then strongly adhered to the first ply.

Tout en maintenant les premiers moyens dans la configuration précédente, on active les deuxièmes moyens de manière à permettre le glissement de la première nappe au droit desdits seconds moyens, et on positionne le tambour à un deuxième diamètre supérieur au premier diamètre.While maintaining the first means in the previous configuration, the second means is activated so as to allow the sliding of the first web to the right of said second means, and the drum is positioned at a second diameter greater than the first diameter.

Il a été mis en évidence que, pour conserver un alignement précis de l'axe des nappes avec la direction circonférentielle, il était nécessaire de maintenir fermement cette partie centrale pendant l'opération de conformation tout en favorisant le glissement des parties situées de part et d'autre de cet axe de manière à permettre la triangulation des nappes entraînant une variation de leur largeur et de l'angle des câbles qui les composent.It has been demonstrated that, in order to maintain precise alignment of the axis of the plies with the circumferential direction, it was necessary to hold this central part firmly during the shaping operation while promoting the sliding of the parts situated on the side and else of this axis so as to allow the triangulation of the sheets causing a variation in their width and the angle of the cables that compose them.

Ainsi tout se passe comme si chaque câble effectuait un mouvement de rotation autour de sa partie centrale, ladite partie centrale étant maintenue fermement en position sur la surface du tambour par lesdits premiers moyens. Par ailleurs, le glissement libre des parties latérales favorise la triangulation des nappes de manière homogène et reproductible sur l'ensemble de la circonférence du tambour.Thus everything happens as if each cable rotated around its central portion, said central portion being held firmly in position on the surface of the drum by said first means. Moreover, the free sliding of the lateral parts promotes the triangulation of the plies homogeneously and reproducibly over the entire circumference of the drum.

Il devient donc aisé de poursuivre la finition du sommet de l'enveloppe en déposant le reste des produits constituant le dit sommet sur le même tambour. Ces produits peuvent comprendre d'autres nappes de renfort sommet pouvant former un angle éventuellement nul avec la direction circonférentielle mais également des profilés caoutchoutiques parmi lesquels figure la bande de roulement du pneumatique.It therefore becomes easy to continue finishing the top of the envelope by depositing the rest of the products constituting the said summit on the same drum. These products may comprise other crown reinforcing plies that can form an angle possibly zero with the circumferential direction but also rubber profiles, among which is the tread of the tire.

Il n'est donc pas nécessaire de réaliser la triangulation des nappes de renfort sommet sur un moyen différent de celui sur lequel est réalisé la confection du sommet. Par ailleurs la mise en oeuvre de ce dispositif s'avère particulièrement intéressante pour maîtriser avec précision la position géométrique des produits constituant le sommet les uns par rapport aux autres, mais également par rapport à une référence prise sur le tambour.It is therefore not necessary to triangulate the crown reinforcement plies on a different means than the one on which the making of the crown is made. Moreover, the implementation of this device is particularly interesting for accurately controlling the geometric position of the products constituting the vertex with respect to each other, but also with respect to a reference taken on the drum.

La réalisation finale du pneumatique se fait alors de manière tout à fait classique en saisissant le sommet ainsi réalisé à l'aide d'un anneau de transfert et en le déposant sur la carcasse conformée.The final realization of the tire is then done in a completely conventional manner by grasping the top thus produced with the aid of a transfer ring and depositing it on the shaped carcass.

Un tambour conforme à l'invention est décrit sommairement ci après en référence aux figures dans lesquelles

  • la figure 1 représente une vue schématique de face d'un tambour conforme à l'invention positionné à son premier diamètre,
  • la figure 2 représente une vue schématique de face d'un tambour conforme à l'invention positionné à son second diamètre,
  • la figure 3 représente une vue schématique en perspective du tambour positionné à son premier diamètre,
  • la figure 4 représente une vue schématique en perspective du tambour positionné à son second diamètre,
  • la figure 5 représente une vue de face d'un tambour à son premier diamètre sur lequel ont été déposées des nappes de renfort sommet,
  • la figure 6 représente une vue de face d'un tambour à son second diamètre sur lequel ont été déposées des nappes de renfort sommet,
  • les figures 7 à 9 représentent en vue schématique les principales phases de fonctionnement des moyens de maintien.
A drum according to the invention is briefly described below with reference to the figures in which
  • FIG. 1 represents a schematic front view of a drum according to the invention positioned at its first diameter,
  • FIG. 2 represents a diagrammatic front view of a drum according to the invention positioned at its second diameter,
  • FIG. 3 represents a schematic perspective view of the drum positioned at its first diameter,
  • FIG. 4 represents a schematic perspective view of the drum positioned at its second diameter,
  • FIG. 5 represents a front view of a drum at its first diameter on which crown reinforcement plies have been deposited,
  • FIG. 6 represents a front view of a drum at its second diameter on which crown reinforcement plies have been deposited,
  • Figures 7 to 9 show a schematic view of the main operating phases of the holding means.

Le tambour 1 représenté sur la figure 1 comprend un ensemble d'éléments 2 arrangés de façon équidistante à un axe de rotation XX'. Ces éléments sont mobiles radialement et permettent de faire varier la surface sensiblement cylindrique du tambour depuis un premier diamètre D1 à un second diamètre D2.The drum 1 shown in Figure 1 comprises a set of elements 2 arranged equidistant to an axis of rotation XX '. These elements are movable radially and make it possible to vary the substantially cylindrical surface of the drum from a first diameter D1 to a second diameter D2.

Chaque élément 2 porte dans sa direction axiale des logements 20, dans lesquels sont placés respectivement les premiers moyens de maintien 3, et les seconds moyens de maintien 4.Each element 2 carries in its axial direction housings 20, in which are placed respectively the first holding means 3, and the second holding means 4.

Les premiers moyens de maintien 3 sont disposés axialement au milieu de chacun des éléments 2, ce qui permet de former un ensemble de premier moyens de maintien disposés circonférentiellement sur l'équateur EE' du tambour 1. L'équateur se définit comme étant l'intersection d'un plan perpendiculaire à l'axe de rotation XX' du tambour et passant axialement au milieu de la surface du tambour, avec le cylindre formé par la surface dudit tambour.The first holding means 3 are arranged axially in the middle of each of the elements 2, which makes it possible to form a set of first holding means arranged circumferentially on the equator EE 'of the drum 1. The equator is defined as being the intersection of a plane perpendicular to the axis of rotation XX 'of the drum and passing axially in the middle of the surface of the drum, with the cylinder formed by the surface of said drum.

Un exemple de réalisation de premier moyen de maintien 3 est représenté sur la figure 7 et peut s'assimiler à un clapet pneumatique 40. Le corps du clapet 40, d'axe AA' sensiblement radial, est disposé dans le logement 20 de l'élément 2. Le corps du clapet 40 comporte une série d'orifices 45 placés sur sa partie latérale. Les orifices communiquent avec une chambre 46.An exemplary embodiment of first holding means 3 is shown in FIG. 7 and can be likened to a pneumatic valve 40. The body of the valve 40, with a substantially radial axis AA ', is disposed in the housing 20 of the element 2. The body of the valve 40 has a series of orifices 45 placed on its lateral part. The orifices communicate with a chamber 46.

Le corps du clapet contient une soupape tubulaire 41 coulissant selon le même axe AA' et comportant à chacune de ses extrémités respectivement un siège 43 et une sortie 47. Le siège de la soupape 43 repose sur la portée 44 sous l'action du ressort 42, et empêche le passage de l'air entre les orifices 45 et la chambre 46. Le corps de la soupape 41 comporte un conduit mettant en communication la chambre 46 et la sortie 47. La sortie 47 est disposée de manière à être radialement légèrement à l'extérieur du plan formé par la surface de l'élément 2. Les orifices 45 sont connectés à une source de vide (non visualisée).The body of the valve contains a tubular valve 41 sliding along the same axis AA 'and having at each of its ends respectively a seat 43 and a outlet 47. The seat of the valve 43 rests on the bearing surface 44 under the action of the spring 42, and prevents the passage of air between the orifices 45 and the chamber 46. The body of the valve 41 comprises a conduit which communicating the chamber 46 and the outlet 47. The outlet 47 is arranged to be radially slightly outside the plane formed by the surface of the element 2. The orifices 45 are connected to a vacuum source (not shown) .

Ainsi, comme cela est schématisé à la figure 8, en déposant une nappe N1 sur la surface de l'élément 2 on rentre la soupape 41 en la repoussant radialement vers l'intérieur. Cette action a pour effet de décoller le siège 43 de la soupape de sa portée 44, et de mettre en communication la chambre 46 et les orifices 45, ce qui provoque une dépression au niveau de la sortie 47 de la soupape. Les flèches portées sur la figure 8 permettent de visualiser la circulation de l'air. Il en résulte une force d'adhésion par dépression qui vient plaquer la nappe à la surface du tambour, la privant de toute possibilité de déplacement au droit du voisinage immédiat de la sortie 47.Thus, as shown schematically in FIG. 8, by depositing a ply N1 on the surface of the element 2, the valve 41 is returned by pushing it radially inwards. This action has the effect of taking off the seat 43 of the valve from its range 44, and to put in communication the chamber 46 and the orifices 45, which causes a depression at the outlet 47 of the valve. The arrows shown in FIG. 8 make it possible to visualize the circulation of the air. This results in a vacuum adhesion force which comes to press the web to the surface of the drum, depriving it of any possibility of displacement to the right of the immediate vicinity of the exit 47.

Les seconds moyens sont semblables aux premiers moyens. Ils sont disposés axialement de part et d'autre de l'équateur EE'. Ils diffèrent néanmoins des premiers moyens 3, en ce que les orifices 45 peuvent être connectés alternativement à une source de vide et fonctionner comme des ventouses, comme cela a été exposé précédemment, ou à une source d'air sous pression. Dans ce deuxième cas, le fonctionnement des seconds moyens, est illustré à la figure 9.The second means are similar to the first means. They are arranged axially on both sides of the equator EE '. However, they differ from the first means 3, in that the orifices 45 can be connected alternately to a vacuum source and operate as suction cups, as has been explained above, or to a source of air under pressure. In this second case, the operation of the second means is illustrated in FIG. 9.

La soupape 41 est maintenue en position rentrée par l'action de la nappe N1 sur la sortie 47. L'air peut alors circuler librement dans le sens des flèches depuis les orifices 45 vers la sortie 47. Il en résulte la création d'un mince coussin d'air entre la surface de l'élément 2 et la nappe N1 qui a pour effet de favoriser le glissement de la nappe sur la surface du tambour située dans le voisinage immédiat de la sortie 47.The valve 41 is held in the retracted position by the action of the web N1 on the outlet 47. The air can then flow freely in the direction of the arrows from the orifices 45 to the outlet 47. This results in the creation of a thin air cushion between the surface of the element 2 and the N1 web which has the effect of promoting the sliding of the web on the surface of the drum located in the immediate vicinity of the outlet 47.

Le tarage du ressort 42 et de la pression d'air à l'entrée des orifices 45 est ajusté de manière à permettre la fermeture de la communication entre la chambre 46 et les orifices 45 lorsque l'on enlève la nappe N1.The setting of the spring 42 and the air pressure at the inlet of the orifices 45 is adjusted so as to allow the closure of the communication between the chamber 46 and the orifices 45 when the web N1 is removed.

La réalisation de premiers moyens et de seconds moyens à partir de clapets pneumatiques s'avère particulièrement simple à mettre en oeuvre. Toutefois il n'est pas exclu de considérer des premiers moyens de nature électromagnétique qui peuvent s'avérer particulièrement performants lorsque les nappes de ceinture du sommet sont des nappes métalliques.The production of first means and second means from pneumatic valves is particularly simple to implement. However, it is not excluded from considering first electromagnetic means that can be particularly effective when the crown belt plies are metal sheets.

La figure 2 représente le tambour 1 positionné à son diamètre D2, et les figures 3 et 4 représentent le tambour 1 aux diamètres D1 et D2 en vue perspective. Les mécanismes commandant le mouvement radial des éléments 2, ainsi que les moyens permettant de supporter et de mettre en rotation le tambour autour de l'axe XX', sont largement connus de l'homme du métier et ne font pas l'objet de la présente description, ils ne sont donc pas représentés sur les figures.FIG. 2 represents the drum 1 positioned at its diameter D2, and FIGS. 3 and 4 represent the drum 1 with the diameters D1 and D2 in perspective view. The mechanisms controlling the radial movement of the elements 2, as well as the means for supporting and rotating the drum about the axis XX ', are widely known to those skilled in the art and are not the subject of the present description, they are not shown in the figures.

Les figures 5 et 6 permettent d'illustrer, en vue schématique, les étapes de la conformation d'une ceinture de renfort sommet composée de deux nappes N1 et N2 respectivement de largeur L1 et L2, L2 étant généralement inférieure à L1. Les câbles de renfort composant les nappes font des angles αl et α2, de signes opposés, avec la direction circonférentielle.FIGS. 5 and 6 illustrate, diagrammatically, the steps of shaping a crown reinforcing belt composed of two plies N1 and N2 respectively of width L1 and L2, L2 being generally less than L1. The reinforcing cables composing the plies make angles α1 and α2, of opposite signs, with the circumferential direction.

Le tambour 1 est positionné à un premier diamètre D1 et les orifices 45 des seconds moyens sont connectés à une prise de vide. En déposant la première nappe de renfort N1, on repousse radialement les sorties 47 des soupapes 41, ce qui a pour effet, comme on l'a vu précédemment, de maintenir la nappe N1 fermement en position sur la surface du tambour 1. On fait également en sorte de faire coïncider le centre de la nappe avec l'équateur EE' de manière à assurer l'alignement géométrique des constituants du pneumatique par rapport à une référence connue.The drum 1 is positioned at a first diameter D1 and the orifices 45 of the second means are connected to a vacuum tap. By depositing the first reinforcing ply N1, the outlets 47 of the valves 41 are radially pushed back, which has the effect, as we have seen previously, of keeping the ply N1 firmly in position on the surface of the drum 1. also so as to make the center of the lap coincide with the equator EE 'so as to ensure the geometrical alignment of the components of the tire with respect to a known reference.

On dépose alors une seconde nappe N2. De manière à ce que la triangulation des nappes s'opère conformément aux lois géométriques exposées à titre d'exemple dans le document FR 2 797 213 déjà cité, il convient de faire adhérer fortement les deux nappes l'une sur l'autre. On remarquera que le maintien des nappes en position sur la surface du tambour pendant cette opération est un moyen de préserver l'alignement géométrique conféré au moment de la pose de nappes.A second layer N2 is then deposited. In such a way that the triangulation of the plies takes place in accordance with the geometric laws set out by way of example in the document FR 2 797 213 already cited, the two plies must be strongly adhered to one another. It will be noted that keeping the plies in position on the surface of the drum during this operation is a means of preserving the geometric alignment imparted at the time of laying the plies.

Cette opération achevée, il est alors possible d'activer les seconds moyens dans la configuration permettant de faire glisser la nappe sur la surface du tambour en mettant les orifices 45 des seconds moyens en communication avec une source d'air sous pression. Les premiers moyens restent dans la position précédente, de manière à maintenir fermement les parties de la ceinture de renfort sommet situées au droit de l'équateur EE' au contact du tambour et d'empêcher tout mouvement de la ceinture au droit des premiers moyens. Le bon maintien de la ceinture le long de la circonférence centrale EE' du tambour permet de conserver l'alignement géométrique des nappes par rapport à une référence fixe sur le tambour 1.Once this operation is complete, it is then possible to activate the second means in the configuration making it possible to slide the sheet on the surface of the drum by putting the orifices 45 of the second means in communication with a source of air under pressure. The first means remain in the previous position, so as to firmly hold the portions of the crown reinforcement belt located at the equator EE 'in contact with the drum and to prevent movement of the belt to the right of the first means. The good maintenance of the belt along the central circumference EE 'of the drum makes it possible to maintain the geometrical alignment of the plies with respect to a fixed reference on the drum 1.

En portant le diamètre du tambour au diamètre D2, on provoque la triangulation des nappes dont la largeur passe respectivement de L1 à L1' et de L2 à L2'. Les angles α1 et α2 formés par les câbles avec la direction circonférentielle à l'équateur passent respectivement aux valeurs α1' et α2' respectivement inférieures à α1 et α2. Ces valeurs α1' et α2' sont sensiblement constantes sur la longueur des câbles mais on observe que ces angles augmentent fortement à chacune des extrémités des câbles dans la zone de bordure des nappes N1 et N2 pour donner une forme en S aux câbles des nappes. En pratique l'écart entre l'angle formé par un câble avec la direction circonférentielle à ses extrémités peut varier de 2° à 15° par rapport à l'angle que fait le même câble avec la direction circonférentielle au centre de la nappe.By bringing the diameter of the drum to the diameter D2, the triangulation of the plies whose width passes respectively from L1 to L1 'and from L2 to L2' is caused. The angles α1 and α2 formed by the cables with the circumferential direction to the equator pass respectively to the values α1 'and α2' respectively lower than α1 and α2. These values α1 'and α2' are substantially constant over the length of the cables, but it is observed that these angles increase strongly at each end of the cables in the edge zone of the plies N1 and N2 to give an S shape to the cables of the plies. In practice, the difference between the angle formed by a cable with the circumferential direction at its ends may vary from 2 ° to 15 ° with respect to the angle that the same cable makes with the circumferential direction at the center of the ply.

Une fois réalisé la conformation de la ceinture, on poursuit l'assemblage du reste des composants formant le sommet du pneumatique de manière conventionnelle.Once the conformation of the belt has been achieved, the rest of the components forming the crown of the tire are continued in a conventional manner.

On observe également que le pas des câbles se resserre. En d'autres termes la distance entre deux câbles consécutifs et sensiblement parallèles entre eux diminue pendant la phase de conformation des nappes. Et ce phénomène est plus marqué au centre que sur les bords de nappe.It is also observed that the pitch of the cables is narrowing. In other words the distance between two consecutive cables and substantially parallel to each other decreases during the conformation phase of the layers. And this phenomenon is more marked in the center than on the edges of the sheet.

Le dispositif, tel qu'il vient d'être décrit, permet de tirer un parti avantageux de ce phénomène connu. En effet, en diminuant le pas et en augmentant la densité de câble au centre, on augmente la rigidité de flexion du sommet et on améliore la durée de vie sur usure du pneumatique.The device, as just described, makes it possible to draw an advantageous advantage from this known phenomenon. Indeed, by decreasing the pitch and increasing the cable density in the center, it increases the bending stiffness of the top and improves the life on wear of the tire.

Cela permet également d'ajuster le pas des nappes au juste nécessaire. En effet, à partir d'une nappe N1 ayant un pas donné P1 il est possible de réaliser des ceintures ayant une infinité de pas en modifiant le taux de conformation. Le taux de conformation est égal au rapport entre le deuxième D2 et le premier diamètre D1. En pratique le taux de conformation peut varier entre 1,03 et 1,5.This also makes it possible to adjust the pitch of the layers to just the necessary. Indeed, from a web N1 having a given pitch P1 it is possible to achieve belts having an infinity of steps by changing the conformation rate. The conformation rate is equal to the ratio between the second D2 and the first diameter D1. In practice, the degree of conformation can vary between 1.03 and 1.5.

Ainsi, connaissant le pas P1 de la nappe N1, l'angle α1', la largeur L1', le pas P1' final de la nappe N1 (ou la densité de câbles que l'on désire obtenir au centre du pneumatique) et le diamètre final D2, il est facile d'ajuster en conséquence la largeur L1, l'angle α1, et le diamètre de pose D1. En pratique on peut obtenir un pas P1' compris entre P1 et 0.75*P1.Thus, knowing the pitch P1 of the ply N1, the angle α1 ', the width L1', the final pitch P1 'of the ply N1 (or the density of ropes which it is desired to obtain at the center of the tire) and the final diameter D2, it is easy to adjust accordingly the width L1, the angle α1, and the laying diameter D1. In practice, a pitch P1 'between P1 and 0.75 * P1 can be obtained.

Ce mode de mise en oeuvre, permet tout à la fois de simplifier la complexité industrielle en diminuant le nombre de référence de nappes de pas P1 différents, et de donner une marge de manoeuvre supplémentaire pour le choix de câbles qu'il devient possible de sélectionner parmi des câbles de diamètre inférieur et dont on autorise l'usage en augmentant la densité par conformation, selon le procédé faisant l'objet de l'invention, de manière à obtenir une résistance structurelle semblable à celle que l'on aurait obtenue avec des câbles plus résistants et d'un pas supérieur.This mode of implementation makes it possible at the same time to simplify the industrial complexity by reducing the reference number of different pitch layers P1, and to give an additional margin of maneuver for the choice of cables that it becomes possible to select. among cables of smaller diameter and whose use is authorized by increasing the density by conformation, according to the method of the invention, so as to obtain a structural strength similar to that which one would have obtained with stronger cables and a higher pitch.

Claims (9)

Tambour (1) à diamètre variable de forme généralement cylindrique, destiné à l'assemblage des nappes de ceinture (N1, N2) et des profilés constituant le sommet d'un pneumatique, comprenant un ensemble de premier moyens de maintien (3) disposés circonférentiellement à l'équateur du tambour EE' et adaptés pour faire adhérer sur le tambour la partie de la nappe (N1) disposée au droit de ces moyens, et caractérisé en ce qu'il comporte un ensemble de seconds moyens de maintien (4) adaptés pour alternativement faire adhérer ou faire glisser librement sur le tambour la partie de la nappe placée au droit des dits seconds moyens, et disposés circonférentiellement et axialement de part et d'autre de l'équateur EE' sur l'ensemble de la surface dudit tambour (1).Drum (1) with variable diameter of generally cylindrical shape, intended for the assembly of the belt plies (N1, N2) and of the profiles constituting the crown of a tire, comprising a set of first circumferentially arranged holding means (3) at the equator of the drum EE 'and adapted to adhere to the drum the portion of the ply (N1) disposed in line with these means, and characterized in that it comprises a set of second holding means (4) adapted to alternately adhere or slide freely on the drum the portion of the web placed in line with said second means, and arranged circumferentially and axially on either side of the equator EE 'on the entire surface of said drum (1). Tambour selon la revendication 1, dans lequel les premiers moyens (3) sont formés par des clapets pneumatiques débouchant à la surface externe dudit tambour (1) et connectés à une prise de vide.Drum according to claim 1, wherein the first means (3) are formed by pneumatic valves opening on the outer surface of said drum (1) and connected to a vacuum outlet. Tambour selon la revendication 1 dans lequel les premiers moyens (3) sont formés par des électroaimants.Drum according to claim 1 wherein the first means (3) are formed by electromagnets. Tambour selon la revendication 1, dans lequel les seconds moyens (4) sont formés par des clapets pneumatiques débouchant à la surface externe dudit tambour et pouvant être alternativement connectés à une prise de vide où à une conduite fournissant de l'air sous pression.Drum according to claim 1, wherein the second means (4) are formed by pneumatic valves opening to the outer surface of said drum and can alternatively be connected to a vacuum outlet or a pipe supplying air under pressure. Tambour selon l'une des revendications 1 à 4, formé par l'assemblage d'un nombre déterminé d'éléments (2) mobiles radialement, sur lesquels lesdits premiers moyens (3) sont placé axialement au milieu du dit élément et lesdits seconds moyens (4) sont placés axialement de part et d'autre desdits premiers moyens (3).Drum according to one of claims 1 to 4, formed by the assembly of a predetermined number of elements (2) radially movable, on which said first means (3) are placed axially in the middle of said element and said second means (4) are placed axially on either side of said first means (3). Procédé d'assemblage d'un pneumatique, comprenant une étape séparée de réalisation du sommet dudit pneumatique sur un tambour à diamètre variable (1) de forme généralement cylindrique, ledit tambour comprenant un ensemble de premier moyens de maintien (3) disposés circonférentiellement à l'équateur EE' dudit tambour et adaptés pour faire adhérer sur le tambour (1) la partie de la nappe disposée au droit de ces moyens et comportant un ensemble de seconds moyens de maintien (4) adaptés pour alternativement faire adhérer ou faire glisser librement sur le tambour la partie de la nappe placée au droit desdits seconds moyens (4), et disposés circonférentiellement et axialement de part et d'autre de l'équateur EE' sur l'ensemble de la surface dudit tambour (1),
caractérisé en ce qu'il comprend les étapes suivantes : - positionner le tambour (1) à un premier diamètre D1, - déposer une première nappe de ceinture sommet N1 composée de câbles de renfort enrobés dans un mélange caoutchouteux faisant un angle donné α1 avec la direction circonférentielle, en activant les premiers et les deuxièmes moyens de manière à faire adhérer l'ensemble de la nappe sur la surface du tambour, - déposer une seconde nappe de ceinture sommet N2, composée de câbles de renfort enrobés dans un mélange caoutchouteux faisant avec la direction circonférentielle un angle α2 donné de signe opposé à l'angle αl, - faire adhérer la seconde nappe N2 sur la première nappe N1, - tout en maintenant les premiers moyens (3) dans la configuration précédente, activer les deuxièmes moyens (4) de manière à permettre le glissement de la première nappe au droit desdits seconds moyens (4), - positionner le tambour à un deuxième diamètre D2 supérieur au premier diamètre D1, - activer les seconds moyens (4) de manière à faire adhérer la nappe à la surface du tambour, - déposer les autres nappes et les autres produits profilés constituant le sommet du pneumatique, - saisir le sommet ainsi constitué avec un anneau de transfert et déposer le sommet sur une ébauche de pneumatique de forme toroïdale. A method of assembling a tire, comprising a separate step of producing the crown of said tire on a drum of variable diameter (1) of generally cylindrical shape, said drum comprising a set of first holding means (3) arranged circumferentially to the drum. equator EE 'of said drum and adapted to adhere to the drum (1) the portion of the web disposed to the right of these means and comprising a set of second holding means (4) adapted to alternately adhere or slide freely on the drum the part of the web placed in line with said second means (4), and arranged circumferentially and axially on either side of the equator EE 'on the entire surface of said drum (1),
characterized in that it comprises the following steps: - position the drum (1) at a first diameter D1, depositing a first crown belt web N1 composed of reinforcement cables embedded in a rubber mix at a given angle α1 with the circumferential direction, activating the first and second means so as to adhere the entire web to the drum surface, depositing a second crown belt ply N2, composed of reinforcement cords embedded in a rubber mix forming with the circumferential direction a given angle α2 of sign opposite to the angle α1, adhering the second ply N2 to the first ply N1, - While maintaining the first means (3) in the previous configuration, activate the second means (4) so as to allow the sliding of the first sheet to the right of said second means (4), positioning the drum at a second diameter D2 greater than the first diameter D1, - activate the second means (4) so as to adhere the web to the surface of the drum, depositing the other plies and other profiled products constituting the crown of the tire, - Grasp the top thus formed with a transfer ring and deposit the top on a toroidal tire blank. Procédé d'assemblage selon la revendication 6, dans lequel le taux de conformation, égal au rapport entre le deuxième diamètre D2 et le premier diamètre D1, est compris entre 1,03 et 1,5.Assembly method according to claim 6, wherein the degree of conformation, equal to the ratio between the second diameter D2 and the first diameter D1, is between 1.03 and 1.5. Procédé d'assemblage selon la revendication 7, dans lequel l'angle formé par un câble à ses deux extrémités avec la direction circonférentielle est supérieur à l'angle formé par le même câble avec la direction circonférentielle dans sa partie centrale.An assembly method according to claim 7, wherein the angle formed by a cable at both its ends with the circumferential direction is greater than the angle formed by the same cable with the circumferential direction in its central part. Procédé d'assemblage selon la revendication 8, dans lequel l'angle formé par un câble à ses deux extrémités avec la direction circonférentielle est supérieur de 2° à 15° à l'angle formé par le même câble avec la direction circonférentielle dans sa partie centrale.An assembly method according to claim 8, wherein the angle formed by a cable at both ends with the circumferential direction is 2 ° to 15 ° greater than the angle formed by the same cable with the circumferential direction in its part. Central.
EP05112437A 2004-12-24 2005-12-20 Building drum for tire belts Active EP1674250B1 (en)

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Cited By (3)

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101172400B (en) * 2006-11-02 2011-01-19 韩国轮胎株式会社 Tire shaping roller using electromagnet
US9216551B2 (en) 2007-06-11 2015-12-22 Pirelli Tyre S.P.A. Process and apparatus for manufacturing tyres
WO2010126507A1 (en) * 2009-04-30 2010-11-04 Societe De Technologie Michelin Apparatus and method for forming tire belts having cords posed at variable angles
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KR101512350B1 (en) 2013-11-06 2015-04-15 한국타이어 주식회사 Vacuum suction type building drum for tire manufacture
CN105774007A (en) * 2014-12-26 2016-07-20 鼎汉科技(厦门)有限公司 Fabric ring drum device capable of expanding and contracting and used for tire forming
CN106273589A (en) * 2015-05-23 2017-01-04 福建建阳龙翔科技开发有限公司 Two-stage nitration once-through method radial tire forming machine
CN111674070A (en) * 2020-06-12 2020-09-18 赛轮集团股份有限公司 Novel tire building machine belt ply drum and tire building method
CN112848807A (en) * 2021-01-29 2021-05-28 山东玲珑轮胎股份有限公司 Curved surface laminating drum design method and curved surface laminating drum

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2037520A5 (en) 1969-03-06 1970-12-31 Pirelli
EP0312300A2 (en) 1987-10-13 1989-04-19 Sumitomo Rubber Industries Limited Pneumatic radial tyre
JPH071603A (en) * 1993-06-15 1995-01-06 Bridgestone Corp Rubber band for green tire molding drum
EP0862986A2 (en) * 1997-03-04 1998-09-09 Sumitomo Rubber Industries Limited Tyre building apparatus and method
FR2797213A1 (en) 1999-08-02 2001-02-09 Michelin Soc Tech PROCESS FOR MANUFACTURING A PNEUMATIC WITH PRECONFORMATION OF A RADIAL SHELL BED TO OBLIQUE THE CABLES OF THE CENTRAL PART
US20010000582A1 (en) * 1997-09-24 2001-05-03 Continental Aktiengesellschaft Process and drum for constructing a green tire
JP2001212889A (en) * 2000-02-02 2001-08-07 Bridgestone Corp Tire forming drum, method of manufacturing tire, and paired guides for fixing tire reinforcing member
US20030051816A1 (en) * 2001-09-14 2003-03-20 Cavalotti Marie-Laure Benedicte Josette False Drum with a variable area vacuum-surface

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3373066A (en) * 1964-01-02 1968-03-12 Uniroyal Inc Method and intermediate article of manufacture for making radial tires
DE1579145B1 (en) * 1965-08-25 1972-02-03 Continental Gummi Werke Ag Machine for building pneumatic tires
SU444690A1 (en) 1973-05-14 1974-09-30 Научно-Исследовательский Конструкторско-Технологический Институт Шинной Промышленности Tape retention device
JPS5225876A (en) * 1975-08-25 1977-02-26 Mitsubishi Heavy Ind Ltd Apparatus for forming breaker layer of radial tire
IT1099513B (en) * 1978-10-25 1985-09-18 Pirelli PROCESS AND EQUIPMENT FOR THE MANUFACTURE OF RADIAL TIRES
GB8312994D0 (en) * 1983-05-11 1983-06-15 Dunlop Ltd Tyre building machinery
US4976804A (en) * 1989-05-05 1990-12-11 The Goodyear Tire & Rubber Company Expandable tire building drum
IT1236885B (en) * 1989-12-19 1993-04-26 Pirelli PROCEDURE FOR THE MANUFACTURE OF TIRES WITH A TORIC PROFILE WITH A HIGH CROSS CURVATURE, APPARATUS FOR ITS IMPLEMENTATION AND PRODUCT OBTAINED
JPH07164555A (en) * 1993-12-14 1995-06-27 Bridgestone Corp Tire molding drum
US6343638B1 (en) * 2000-02-23 2002-02-05 The Goodyear Tire & Rubber Company Tire belt folding drum
JP4685276B2 (en) * 2001-06-12 2011-05-18 住友ゴム工業株式会社 Belt forming drum
CN100526060C (en) * 2001-06-19 2009-08-12 普利司通株式会社 Method of forming tire component member
JP2004034613A (en) * 2002-07-05 2004-02-05 Yokohama Rubber Co Ltd:The Method for manufacturing pneumatic radial tire and pneumatic radial tire manufactured by the method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2037520A5 (en) 1969-03-06 1970-12-31 Pirelli
EP0312300A2 (en) 1987-10-13 1989-04-19 Sumitomo Rubber Industries Limited Pneumatic radial tyre
JPH071603A (en) * 1993-06-15 1995-01-06 Bridgestone Corp Rubber band for green tire molding drum
EP0862986A2 (en) * 1997-03-04 1998-09-09 Sumitomo Rubber Industries Limited Tyre building apparatus and method
US20010000582A1 (en) * 1997-09-24 2001-05-03 Continental Aktiengesellschaft Process and drum for constructing a green tire
FR2797213A1 (en) 1999-08-02 2001-02-09 Michelin Soc Tech PROCESS FOR MANUFACTURING A PNEUMATIC WITH PRECONFORMATION OF A RADIAL SHELL BED TO OBLIQUE THE CABLES OF THE CENTRAL PART
JP2001212889A (en) * 2000-02-02 2001-08-07 Bridgestone Corp Tire forming drum, method of manufacturing tire, and paired guides for fixing tire reinforcing member
US20030051816A1 (en) * 2001-09-14 2003-03-20 Cavalotti Marie-Laure Benedicte Josette False Drum with a variable area vacuum-surface

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 04 31 May 1995 (1995-05-31) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 25 12 April 2001 (2001-04-12) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2072240A1 (en) * 2007-12-18 2009-06-24 The Goodyear Tire & Rubber Company Sleeveless tire building drum
EP3037249B1 (en) * 2014-12-23 2018-03-21 The Goodyear Tire & Rubber Company Sleeveless tire building drum
CN114311781A (en) * 2022-03-16 2022-04-12 山东华盛橡胶有限公司 All-steel radial tire belt drum and tire crown material fitting method
CN114311781B (en) * 2022-03-16 2022-05-20 山东华盛橡胶有限公司 All-steel radial tire belt drum and tire crown material fitting method

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DE602005011563D1 (en) 2009-01-22
JP4975323B2 (en) 2012-07-11
FR2879957A1 (en) 2006-06-30
FR2879957B1 (en) 2007-03-02
EP1674250B1 (en) 2008-12-10
ATE416909T1 (en) 2008-12-15
CN100566984C (en) 2009-12-09
US20060137805A1 (en) 2006-06-29
US20090188609A1 (en) 2009-07-30
CN1792624A (en) 2006-06-28
BRPI0505591A (en) 2006-09-12
US8168021B2 (en) 2012-05-01

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